There is not any evidence what so ever that a person who might commit a murder with a gun would just use the next available option to them such as a knife. That was something that was just introduced to the discussion as a fact when in reality it’s something you have made up.
In fact it’s immediately clear that to most people they are two very different things precisely because one of them is literally just pushing a button.
There is a reason why the murder rate is 7x higher because the access to guns requires a much lower buy in to commit the act in the first place.
Hence why people argue for stricter gun control laws. Mass access is precisely the problem.